The company's name and motto ("L'eau du ciel", French for "The water of the sky") implies that they sell bottled rain water. The vending machines in GTA V also say "may contain acid", which may be a reference to acid rain, a common pollutant found in rain which may occur in large metropolitan areas. The Acid reference could also be to Carbonic Acid which occurs when Carbon Dioxide mixes with water in the atmosphere.